Hello, Canadian here, with a question about filtering plant matter from bho extraction. I have noticed that when I run food grade butane through any plant matter that has any fan leafs in it, then I get a black residue that comes off the material. I do not have this problem when I use high quality trim or bud. It only happens with lower quality material. Currently I use 4 coffee filters to filter my bho before reducing it and vac purging. Is there any way to filter the butane better so I do not get the black residue from the fan leafs?